US3761200A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Bladed rotors
Assignee: SECR DEFENCE
•
Filing: 1971-11-26
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Granted: 1973-09-25
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Expires: 1991-11-26
Abstract
Abstract A bladed rotor for a gas turbine engine comprises a ring of blades mounted on a disc. The platforms for the blades are provided on a separate platform ring which has axially extending sealing rings at the axial ends to form seals with adjacent stator rings. Additional features are that additional radial flanges can be provided at the axial ends of the platform ring to act as sealing plates and locking tabs.
Inventors
- 👤 T Gardiner
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 18:07
CPC Classifications
F; F01; F01D; F01D11/00; F01D11/005; F01D11/006; F01D11/008; F01D5/00; F01D5/30; F01D5/3007; F01D5/3015; Y; Y02; Y02T; Y02T50/00; Y02T50/60
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
85 words
A bladed rotor for a gas turbine engine comprising an annular rotor disc having means defining a plurality of slots in its outer periphery, and a plurality of aerofoil shaped blades having root portions engaged in the slots, a platform ring surrounding the periphery of the disc, said ring having means defining slots therein into which the blades are fitted, and having at least at one axial end a continuous circumferential sealing member, means being provided for removably attaching the platform ring to the disc.
Claim 2
Dependent Claim
85 words
A bladed rotor for a gas turbine engine comprising an annular rotor disc having means defining a plurality of slots in its outer periphery, and a plurality of aerofoil shaped blades having root portions engaged in the slots, a platform ring surrounding the periphery of the disc, said ring having means defining slots therein into which the blades are fitted, and having at least at one axial end a continuous circumferential sealing member, means being provided for removably attaching the platform ring to the disc.
Claim 3
Dependent Claim
57 words
A bladed rotor according to claim 1 and wherein each blade has a vestigial platform portion on each aerofoil surface adjacent the root of the blade, and the platform ring is in the form of a cage having a plurality of axially extending bars defining the slots therebetween, the slots being dimensioned to receive said platform portions.
Claim 4
Dependent Claim
46 words
A bladed rotor according to claim 2 and wherein the vestigial blade platforms are shaped to provide support for those parts of the platform ring which contact the vestigial blade platforms against radial growth under centrifugal forces, and to act as damping means for the blades.
Claim 5
Dependent Claim
39 words
A bladed rotor according to claim 1 and wherein the platform ring has at each axial end thereof a radially extending flange which acts as a locking means to retain said blade roots against axial movement in the slots.
Claim 6
Dependent Claim
48 words
A bladed rotor according to claim 4 and wherein one of said flanges extends radially to a point inward of the bottoms of said slots and acts as a sealing plate to prevent leakage of air from one side of the blade to the other beneath the platform.
Claim 7
Dependent Claim
38 words
A bladed rotor according to claim 1 and wherein the diameter of the sealing rings at each axial end of the platform ring are substantially equal to the inner diameter of the air flow passage at said ends.
Claim 8
Dependent Claim
19 words
A bladed rotor according to claim 2 and wherein the bars have axial supporting ribs extending radially inwardly therefrom.
Claim 9
Dependent Claim
42 words
A bladed rotor according to claim 7 and wherein the ribs form one side wall of a cavity between the radially outer periphery of the rotor disc and the underside of the platform ring, anD damping means are disposed in said cavity.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-09-24 | 1977-03-26 | 1977-09-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-09-24 | 1981-03-26 | 1981-09-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-09-24 | 1985-03-26 | 1985-09-25 | $7700.00 | Window Closed / Lapsed |